More Japanese Slang

Yeah, I have some difficulty with the slang and such... This is sort of net-speak I fear.

「うオェァーーーーーー！！！！！
落下中だが聞いてほしい
今、こうじけんばはィヤッハー！！
BとYとでおぅいえぃ！！！」

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So far I've got...
"Woah!!! I know you're falling, but I'd like you to listen." (not aiming to be literal)

I suspect 「こうじけんば」 is a typo of 「こうじげんば」, even though it makes no sense in-context.
What is 「ィヤッハー」 though? And what is with the 「おぅいぇい」?

I should note this comes from a game from 2007 that I'm translating so as to learn net-speak and such. I'd like to become more robust in my knowledge of colloquialisms.

LaniAlden said:

I suspect 「こうじけんば」 is a typo of 「こうじげんば」, even though it makes no sense in-context.
What is 「ィヤッハー」 though? And what is with the 「おぅいぇい」?

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I'm soooo not the go-to source for much of anything, since my Japanese is still pretty poor.... but I think I can help with one of these. I think the ィヤッハー might be "IYH", 2chan slang for impulsive buying.

IYHとは（意味、元ネタ、使い方）2ch

Although I don't know why the ィ is tiny... so I could be off-base.... maybe someone smarter should answer, lol.

I'm in the same boat as Lauranne. In fact, I'm not, I'm in the other boat that sank, somewhere at the bottom of the ocean. My knowledge of Japanese still pretty much... doesn't exist yet. Still, "ィヤッハー" sounds pretty much like yahaa! as in "yahoo!" to me.

Zlarp said:

I'm in the same boat as Lauranne. In fact, I'm not, I'm in the other boat that sank, somewhere at the bottom of the ocean. My knowledge of Japanese still pretty much... doesn't exist yet. Still, "ィヤッハー" sounds pretty much like yahaa! as in "yahoo!" to me.

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I thought this too, but it's being used as a fundamental part of the sentence, describing the (presumably typoed) construction site.

I've figured it out. Ish. There was a post on okwave asking the same thing that didn't show up on searches I suppose.

So for posterity - 「イヤッハー」 is a descriptive word/exclamation based either on the character Linebeck from Zelda: Phantom Hourglass or from the comedian Kosugi Ryuuichi, who is in the comedy duo "Black Mayonnaise." Either way, it's an exclamation of joy. The 「おういえい」 bit I'm interpreting as a strange way of making 「追う」 imperative as it makes sense to "follow the coins" by running and jumping, which is what B and Y do.

I'm not sure on ANY of this so please, if anyone knows anything else, please tell me!

ィヤッハー indeed is an exclamation, but it's originally from Dragon Ball.
A well-known gag Kosugi uses is ヒーハー. The answerer in the site you found was just kidding.

おぅいえぃ is just a transliteration of "Oh Yay".

Oh wow, thanks! This one was tough x.x.

I don't really watch anime or read manga or anything (more about literature, short stories, etc), so there's a lot of references I simply don't get.